"Tristan's f—ed up big time. He knows it. And Khloé's pissed!" the source told Life & Style exclusively. "Khloé's done. She's so f–king done. Her stomach hurts so bad and it's not from the pregnancy. She could kill Tristan right now."

And although it's unclear where their relationship stands at this point, a source told In Touch that Koko allowed Tristan to be at the hospital to witness the birth of their child together. TMZ reported that Khlo was going to put her "personal feelings" aside, as she didn't want to ruin the best day of her life. But, of course, the Cavs star wasn't the only person by her side during the delivery — a source exclusively told Life & Style that Kris Jenner and the rest of the Kardashian/Jenner crew rushed to Celevand by private plane hoping to make it before the baby arrived.

And they did. Kim Kardashian even helped Khlo push! One day after the birth, Kim tweeted, "@khloekardashian I'm so happy for you! Your baby girl is so beautiful! You are so strong, you made that look so easy! I can't wait for our baby girls to grow up as best friends the way we are! I'm so happy I was able to return the favor of holding your leg while you pushed LOL." Kim — who is mom to North, 4, Saint, 2, and Chicago, two months — also told the fans on Twitter that Khloé's daughter is "so gorgeous."

💕 @khloekardashian I’m so happy for you! Your baby girl is so beautiful! You are so strong, you made that look so easy! I can’t wait for our baby girls to grow up as best friends the way we are! I’m so happy I was able to return the favor of holding your leg while you pushed LOL

Since the birth, Khlo's famous family aren't the only ones sending their well wishes her way on social media. Her best friend, Malika Haqq, shared a photo of Khloé on Instagram with the caption, "Right by your side. Congrats my love! Thank you for my niece." She noticebly didn't mention Tristan, which isn't so shocking as Malika is the only member of Koko's inner circle to unfollow him on Instagram post-cheating scandal. Malika's sister, Khadijah Haqq, shared a cryptic message on Instagram that had fans convinced it was about Tristan and his cheating ways.

The message read, "The best thing a father can do for his children is to love their mother — Jon Wooden." Oh yeah — and Kourtney Kardashian liked it. Besides Kourt's show of support for Khloé and her disgust for Tristan, the other sisters have kept quiet on the subject. Kylie Jenner has been busy promoting her lip kits and flaunting her assets — which both seem like valid distractions — while Kim shared several photos of her vacation in Turks and Caicos.

On Tuesday, April 10, Daily Mail released video footage of a man who resembles Tristan making out with Instagram model Lani Blair at a club in NYC on Saturday, April 7. But that wasn't all! Shortly after, TMZ posted surveillance video footage of Tristan outside a Washington DC hookah lounge in early October where he can be seen smooching with not one but TWO different women at the same time. This all came less than two months after In Touchshared video footage of Tristan flirting with a different woman at another event. What a guy, huh?

"[Khloé's] beyond pissed," our source continued. "She's embarrassed and feels so betrayed and feels like Tristan is a liar. A cheater. He's no different than Lamar."

If you recall, Khlo's ex Lamar Odom cheated on her throughout their marriage. He recently admitted the KUTWK star knew about his drug use and that he regretted his affairs. "B—-es and THOTs came out of the woodwork. If there is one thing I regret when I was married, it was having multiple affairs with different women," he told Us Weekly. "That wasn’t the stand-up thing to do. I wish I could have kept my d–k in my pants."

There's no word yet on whether or not the baby will take Tristan's last name or even if the baby girl's first name will start with the letter "T" like Khloé had previously said it would. She tweeted last month, "Beautiful but I’m going with a babe that starts with a T." Regardless of the moniker, sources exclusively told Life & Style that Tristan is completely head over heels for his daughter. "He was happy to see his daughter and was overjoyed," the insder said. "She has his eyes and he couldn’t stop gushing over her."

But with the cheating scandal still looming over both Khloé and Tristan's heads, the Good American designer and her family are trying to figure out how to pick up the pieces. "She's been crying, really taking this hard and doesn't know what to do. This is one of the most vulnerable and important times in her life. She's carrying his baby, her first child. She's so over him right now."